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Serpae Tetra head down & coughing motion...

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I have 7 Serpae tetra in QT and just noticed today (2 weeks in qt) that one is swimming head pointed down with a coughing motion...kinda like he is going to look for food in the gravel but isn't. Parameters are 0/0/20, just did a 50% pwc in the event it was related to the nitrates (my main tank never gets above 10). I don't see this behavior in any of the other tetras in the qt tank. Any insights or recommendations?

Well, continued to google this behavior and found out it is from feeding flakes on top of the water and air being taken in while gulping for food. I now hold the flakes below the water line then release so they float down a bit. Problem solved!!! Amazing what you learn on a daily basis, love it :D